#include <iostream>
#include <string>

using namespace std;

int main(int argc, char const *argv[])
{
    string s1 = "今天天气";
    string s2 = "真好";

    // 运算符重载技术   strcat   ==>> 重载在 + 
    cout << s1 + s2 << endl;

    return 0;
}

